Triton, a Greek sea God, was the son of Poseidon and the sea Goddess Amphitrite. Triton was an archetype of various sea creatures which have appeared through the ages including both mermen and mermaids. Although masculine in his upper body, his lower body was that of a fish and lacked visible genitalia. He was a benevolent demi-God, often escorting other maritime divinities along their journeys, but had the bad fortune to father the terrible multi-headed monster Scylla made famous in Homer's The Odyssey. Although kind himself, his monstrous daughter Scylla was an expression of his inner duality.
The cover of Life Magazine from 1937 at bottom left shows another rendering of Triton as androgynous. The image is of a sculpture installed in St. Louis in 1938 by the Swedish sculptor Carl Milles to mark the confluence of the Missouri and Mississippi Rivers.